Kinetis K50: 72MHz Cortex-M4 Performance MCU, 160KB Flash, 32KB SRAM, Full-Speed USB, 64-LQFP
Freescale
Freescale - MK50DX128CLH7R
$6.81 - $9.26
Freescale - MK50DX128CLK7
Freescale - MK50DX128CLL7
Freescale - MK50DX128CMC7
Freescale - MK50DX256CLK7
$8.15 - $9.62
Freescale - MK50DX256CLL7